Transform from comma separated text to list

Hello, I am creating an app that when pressing the button, makes me several web queries, to a server with PHP (I have already solved this) ...
the issue is that when trying to take these lists it gives me an error, I already tried to transform the text to a list, (the elements being separated by commas) but it keeps giving me an error.

You are showing a list of lists. Use the select item block to select the first item, then you will have the inner list to work with.

and I have tried everything but it gives me an error, noc what to do in fact the following is already intended in other apps and it has worked for me .......

but nothing, it gives me an error too ...

and the data is correctly separated by commas, but nothing ...

show what is coming back in your responseContent

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